Add entry for readline documentation.

Doc/Makefile.deps

@@ -226,6 +226,7 @@ LIBFILES= $(MANSTYLES) $(COMMONTEX) \
 	../lib/libnis.tex \
 	../lib/libpipes.tex \
 	../lib/libpty.tex \
+	../lib/libreadline.tex \
 	../lib/librlcompleter.tex \
 	../lib/libsched.tex \
 	../lib/libstatvfs.tex \

Doc/lib/lib.tex

@@ -170,6 +170,7 @@ and how to embed it in other applications.
 \input{libzlib}
 \input{libgzip}
 \input{libzipfile}
+\input{libreadline}
 \input{librlcompleter}
 
 \input{libunix}			% UNIX Specific Services